Improvement in piston-packing



@anni @imita ANDREW MCMULLIN, PATERSON, NEW JERSEY.

'Lette/rs .Patent No. 91,250, dated June 15, 1869.

IMPRVEMENT IN PISTON-PACKING.

The Schedule referred to in these Letters Patent and making part ot the same.

Apiston Figure 2, an end view, showing the holders in their relation to Vthe steam-packing rings and piston-rod, and the steam-space or channel into which the steam en- -ters for expanding the packing-rings;

. Figure 3, a longitudinal section through holders;

Figure 4, an end view of pistou-head with packing removed;

Figures 5 and 6, lplain and 'section of steam-packing ring.; and y Figures 7 and 8, views of holder removed from piston-head.

In the said drawingsr A indicates the piston-rod, passing through the piston-head, and secured by a key, B, at its outer end;

C is the piston-head, cast in one piece;

D, the. recesses inthe face d of the head, for ref ception ofthe holders;

E E is the double rectangular steam-packing seat on-the face of the piston-head; and

. F is the channel, or steam-space between the piston-head and packing, for expanding and pressing the packing against the cylinder by means of the steam. (Seefig. 2..)

This head may be cored out and cast hollow, instead of solid, if preferred.

G is the steam-packing ring, having a rectangular bearing, H, to fit on the piston-head, (forming'ground joints a plate, I, for breaking joint in the packingring, to prevent-access ofthe steam from one packing to the other; and recesses, K, into which the holders which secure the packing-rings to the piston-head rest; and

L is the sliding holder, which slides into the. piston-V head, to admit of the packing-rings being placed on the piston-head, and which, on pushing the piston-rod through its head, slides out into the recesses K in the packing-rings, securely fastening the packing-rings to the pistou-head.

The piston-head, as already explained, is placed on its rod, by first pushing the holders back into the piston-head, and slipping the packing-rings on the pistonhead. Next, the'piston-rod is pushed through the head and keyed, said rod in its passage pushing the hoiders into their places on the packing-rings, and in this manneithe piston-head is secured to its rod and the pack` ing-rings to the piston-head, dispensing with the use of the ordinary ange, follower, springs, and bolts, which were liable to work loose, and cut and tear the cylinder.

Furthermore, the steam acting on the face .of the piston, tends to keep the packing-rings up to the head, while the steam entering the channels F K, expands and presses the packing-rings against the cylinder, and the holders up t`o and against the piston-rod.

What I claim as my invention, and desire 'to secure by Letters Patent, is

The piston-head C, the rings G, and holders L, the channels F and K, and rod A, all constructed and arranged substantially as described.

1n testimony whereof', I have hereunto set my signature, this 22d day of March, A. D. 1869.'

Witnesses: ANDREW MGMULLIN.

SAMUEL MGMULLIN, J ons BUSTARD. 

